How 5' Flanking region and 5' UTR are different?

The 5' flanking region is a region of DNA that is adjacent to the 5' end of the gene. The 5' flanking region contains the promoter, and may contain enhancers

A Natural Novel Mutation in the blaNDM-5 Promoter Reducing Carbapenems Resistance in a Clinical Escherichia coli Strain

5' Untranslated Region, 5' UTR, Five Prime UTR

Mind your caps and Poly A tails

Translation from the 5′ untranslated region shapes the integrated stress response

Untranslated region - Wikipedia

Translational control by 5′-untranslated regions of eukaryotic mRNAs

Five prime untranslated region - Wikipedia

Deciphering the rules by which 5′-UTR sequences affect protein expression in yeast

Genome Browser User's Guide

Mysteries of gene regulation: Promoters are not the sole triggers of gene expression - Computational and Structural Biotechnology Journal

Untranslated regions : how 5' and 3' UTRs regulate transcription and translation